It is basically the Queens gambit but without pushing the d pawn and also like the Reti. Why doesn't more GM play it?

I think the problem is that black can play any move against it. This means white has to prepare for a bunch of openings+variations+subvariations which is pretty time consuming.

As you can see in the diagram black has so many first moves to choose from. And even after those moves black can choose different variations. White will probably just push one central pawn to transpose into another opening.

I'm not an expert of that opening so I can't say whether there are some tricks here for example move order tricks or something or whether there are some independent liens.